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bea3d7e has redesigned the regexp engine so as all the allocations go through palloc() with a dedicated memory context. hba.c had to cope with the past memory management logic by going through all the HBA and ident lines generated, then directly free all the regexps found in AuthTokens to ensure that no leaks would happen. Such leaks could happen for example in the postmaster after a SIGHUP, in the event of an HBA and/or ident reload failure where all the new content parsed must be discarded, including all the regexps that may have been compiled. Now that regexps are palloc()'d in their own memory context, MemoryContextDelete() is enough to ensure that all the compiled regexps are properly gone. Simplifying this logic in hba.c has the effect to only remove code. Most of it is new in v16, except the part for regexps compiled in ident entries for the system username, so doing this cleanup now rather than when v17 opens for business will reduce future diffs with the upcoming REL_16_STABLE. Some comments were incorrect since bea3d7e, now fixed to reflect the reality. Reviewed-by: Bertrand Drouvot, Álvaro Herrera Discussion: https://postgr.es/m/ZDdJ289Ky2qEj4h+@paquier.xyz
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.